Definition of Pyrochlore

1.n. A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; -- so called from its becoming grass-green on being subjected to heat under the blowpipe.

Definition of Pyrochlore

1. Noun. (mineral) A mineral whose composition is that of a mixed niobate mostly of sodium, calcium and cerium, (Na,Ca)2Nb2O6(OH,F). ¹